Electric lamp.



S. M. HINO.

ELECTRIC LAMP. APPLICATION FILED Nov.1z,1912.

Patented Dec. 8, 1914.

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SETH M. HINO, F ROCKSPRINGSLWYOMING.

ELECTRIC LAMP.

To all whom it may concern.'

Be it known that I, SETH M. HINo, a citizen of the United States, residing at Rock Springs, in the county of Sweetwater and State of lVyoming, have invented new and useful Improvements in Electric Lamps, of which the following is a specilication.

This invention relates to improvements 1n electric lamps and has particular application to variable candle power incandescent lamps. l

ln carrying out the present invention, it is my purpose to provide an incandescent lamp wherein by means of a plurality of 1ndependent filaments the candle power of the lamp may be varied. n

lt is also my purpose to provide an incandescent lamp wherein by means of a plurality of independent filaments and switches controlling the flow of current to the filaments, the latter. may be rendered incandescent to give the desired candle power and which will embrace the desired features of simplicity, efficiency and durability coupled with cheapness of cost in manufacture and marketing, and furthermore, my 11nproved lamp may be applied to any type of socket and removed therefrom when desired.

With the abovey and other objects in View, the invention consists in the construction, combination and arrangement of parts hereinafter set forth in and falling within the scope of the claim. 4

In the accompanying drawings, Figure 1 is a view in elevation of a lamp constructed in accordance with my present invention, the bulb being partly broken away. Fig. 2 is a fragmentary sectional view through the lamp. l

-Referring' now to the accompanying drawings in detail, the numeral 1 indicates the threaded plug of the lamp which is preferably of hollow construction and lined interiorly with suitable 'insulating material 2, the plug 1 being adapted to fit any type of lamp socket as will be readily understood.`

Depending from the plug l and in open communication therewith is a hood 3 insulated from the plug by a ring 4 of insulating material and composed of annulan metallic sections 5, 6 and 7 of various diameters and insulated from one another as at 8..

The numeral 8 indicates the lamp bulb which is constructed as usual and has the relatively small end thereof secured within the Specification of Letters Patent.

Patented Dec. 8, 1914.

Application led November 12, 1912. Serial No. 730,933.

lower section 7 of the hood 3, While depending into the bulb and formedintegral wit-h the upper end thereof is the protecting tube 9, the latter having formed integral with the free end thereof a glass rod l0. This rod l0 is provided with sets of radially'extending lingers 11 suitably spaced apart along the length of the rod and forming with the rod a filament support. The section of the 'hood 3 is formed with a series ofapertures Upon the head of the plug 1 is a contact I 18 from which leads a conductor 19 extending through the tube 9 by way of the plug l and hood 3. A second contact 2O is secured to the side of the plug l and from the last-named conductor leads a conductor 21 terminating in branch wires 22 each of which leads and is electrically connected to the pivot stud of one of the switch blades. From the contacts 17 of the switch blades lead conductors 23, 24 and 25 which extend through the tube 9 and are insulated fr om one another and from the conductor 19 by suitable packing material. Connected to the free terminal of the conductor 23 is one end of a filament 26 extending approximately the full length of the rod 10 and supported l by the outer sets of radial fingers 11 and having the free terminal thereof tapped onto the conductor 19, while to the free terminal of the conductor 24 is fastened one end of a second filament 27 of less length vthan the filament 26 carried by the sets of fingers 11 inwardly of and adjacent to the outer sets of such lingers, the free terminal of the last-named filament being also connected to the conductor 19. A third filament 28 has one terminal thereof tapped onto the free-end of the-conductor 25 and is carried by the innermost sets of lingers 1l and has the freeV end thereof connected to the conductor 19. y

. From this construction, it will be seen that the filaments of the lamp are connected in multiple or parallel with the contacts 18 and 20 and may be rendered incandescent independently of one another through the medium of the switches composed of the blades and contacts. For instance, should it be desired to render the filament 26 incandescent, the switch in the conductor 23 is closed whereby current flows through the said filament and illuminates Athe lamp to the desired candle power. Should it be desired to lessen the candle power of the lamp, the switch in the conductor 23 is opened and one of the other switches closed whereby a smaller length of filament will berendered incandescent to illuminate the lamp. On

the other hand, should it be desired to 0b-v tain the fullcandl'e power from the lamp all of the switches are closed thereby enabling the current to travel through all of thelaments and illuminate the lamp to itsgreatest capacity. Although I have shown the 'three filaments and a -similar v number of switches for controlling the same, it will be apparent that any number of filaments and switches'may be employed.

I claim:

In an electric lamp, a rod, sets of radially extending fingers secured to said rod and suitably spaced apart along the length thereof and having the outer ends thereof bent upon themselves to form eyes', filaments carried by the respective sets of fingers and disposed one within theother and of relatively different lengths, each lilament being trained through the eyes of the respective fingers, an electric circuit including said filaments in multiple, and means whereby said filaments may be illuminated independently of one another'.

ln testimony whereof I afhx my signature 1n presence of two witnesses.

sETH M. HrNo.

Witnesses:

F RED W. JOHNSON, V. R. MCHALE. 

